Who said "I've never been confident about anything in my life."?

This quote is attributed to Charlie Brown.

I've never been confident about anything in my life. - Charlie Brown

"I've never been confident about anything in my life."

Charlie Brown Courage

"Good grief!"

"I got a rock."

"Rats! I did it again."

"Why is it that everything I do turns into a disaster?"

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."